For crawlers through age 5. A warm and dry environment with play house, tree house, ball pit, slides, crawler's corner and more. Parents provide supervision. Drop-in fees are $3.50 for Mountlake Terrace residents and $4.00 for non-residents with an hourly fee per child, with a maximum of four children per adult. Please no food, gum, drinks, chairs, or strollers in the Indoor Playground. The Indoor Playground is available to rent for parties! For additional information please view the Indoor Playground Schedule (PDF).